US 12,311,430 B2Granted

Mandrel for pipe bending machine

AssigneeCml International S.P.A.

InventorsAlessandro Caporusso, Werner Davide D'Agostino, Paolo Sacco

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Abstract

A mandrel for pipe bending machine has an elongated body (3) with a first end connected to a mandrel rod and a second end, opposite to the first, in which there is a spherical seat (8), several intermediate articulated elements (10) and a terminal articulated element (11). Each intermediate joint element (10) and the terminal joint element (11) have a peripheral part (12) configured so as to lean against the inner wall of a pipe (T) to be bent. Each intermediate articulated element (10) has a cup-shaped part (13) in one piece, and a stem (19) extending externally from it, and a spheroidal part (21) in one piece, configured so as to be introduced in a cup-shaped part (13) of a previous intermediate articulated element (10).

Claims21

Dependent claims

A mandrel for a pipe bending machine, comprising:

an elongated body (3;
300) having a central axis (t), a first end connected to a mandrel rod and a second end, opposite to the first one, in which there is a spherical seat (8);
a terminal articulated element (11;
111;
112;
113) having a peripheral part (12;
121) which is configured so as to rest on an internal wall of a pipe (T) to be curved;
and
an intermediate articulated element (10;
101;
102;
103;
104;
105;
106) comprising:
a peripheral part (12;
121) which is configured so as to rest on an internal wall of a pipe (T) to be curved;
a cup-shaped part (13;
131;
132;
133;
134;
135;
136) in one piece, having a central axis (c) and being equipped with a spherical seat (14) with an opening delimited by a circumferential edge (15), and an articulated element stem (19;
191;
192;
194;
195;
196) extending externally from the cup-shaped part (13;
131;
132;
133;
134;
135;
136) along the central axis (c) of the cup-shaped part and terminating in a stem end (40);
and
a spheroidal part (21;
210) in one piece that
has a central axis(s),
is delimited by a flat face (25) by a secant plane perpendicular to the central axis(s) to have a height that enables the spheroidal part to be introduced into the spherical seat (8) in the elongated body (3;
300) and retained therein by the circumferential edge (15) of the elongated body (3;
300),
when located within the spherical seat and oriented such that the secant plane is perpendicular to the central axis (c) of the cup-shaped part, is the only portion of the intermediate articulated element in contact with the spherical seat, and
that has a main hole (24;
240) directed along the central axis(s) of the spheroidal part (21;
210).

43 more elements

A mandrel for pipe bending machine, comprising:

an elongated body (3;
300) having a central axis (t), a first end connected to a mandrel rod and a second end, opposite to the first one, in which there is a spherical seat (8);
a terminal articulated element (11;
111;
112;
113) having a peripheral part (12;
121) which is configured so as to rest on an internal wall of a pipe (T) to be curved;
and
an intermediate articulated element (10;
101;
102;
103;
104;
105;
106) comprising:
a peripheral part (12;
121) which is configured so as to rest on an internal wall of a pipe (T) to be curved;
a cup-shaped part (13;
131;
132;
133;
134;
135;
136) in one piece, having a central axis (c) and being equipped with a spherical seat (14) with an opening delimited by a circumferential edge (15), and an articulated element stem (19;
191;
192;
194;
195;
196) extending externally from the cup-shaped part (13;
131;
132;
133;
134;
135;
136) along the central axis (c) of the cup-shaped part and terminating in a stem end (40);
and
a spheroidal part (21;
210) in one piece that
has a central axis(s),
is delimited by a flat face (25) by a secant plane perpendicular to the central axis(s) to have a height that enables the spheroidal part to be introduced into the spherical seat (8) in the elongated body (3;
300) and retained therein by the circumferential edge (15) of the elongated body (3;
300), and
that has a main hole (24;
240) directed along the central axis(s) of the spheroidal part (21;
210),
wherein
the cup-shaped part (135;
136) has a recess (38) in the circumferential edge (15),
the articulated element stem (195;
196) is smooth and has a side notch (36),
the main hole (240) of the spheroidal part (210) is smooth,
the spheroidal part (210) is provided with a tertiary threaded hole (260) which has an inclined axis (i) with respect to the central axis(s) of the main hole (240), is communicating with the main hole (240) and is able to receive a set screw (270), when the recess (38) is concentric to the tertiary threaded hole (260), the set screw (270) being suitable for reaching the side notch (36) of the stem (195;
196) so as to lock the position of the articulated element stem (195;
196), when inserted in the main hole (240) of the spheroidal part (210), in order to prevent any rotation and shift of the articulated element stem (195;
196).

52 more elements

A mandrel for pipe bending machine, comprising:

an elongated body (3;
300) having a central axis (t), a first end connected to a mandrel rod and a second end, opposite to the first one, in which there is a spherical seat (8);
a terminal articulated element (11;
111;
112;
113) having a peripheral part (12;
121) which is configured so as to rest on an internal wall of a pipe (T) to be curved;
and
an intermediate articulated element (10;
101;
102;
103;
104;
105;
106) comprising:
a peripheral part (12;
121) which is configured so as to rest on an internal wall of a pipe (T) to be curved;
a cup-shaped part (13;
131;
132;
133;
134;
135;
136) in one piece, having a central axis (c) and being equipped with a spherical seat (14) with an opening delimited by a circumferential edge (15), and an articulated element stem (19;
191;
192;
194;
195;
196) extending externally from the cup-shaped part (13;
131;
132;
133;
134;
135;
136) along the central axis (c) of the cup-shaped part and terminating in a stem end (40);
and
a spheroidal part (21;
210) in one piece that
has a central axis(s),
is delimited by a flat face (25) by a secant plane perpendicular to the central axis(s) to have a height that enables the spheroidal part to be introduced into the spherical seat (8) in the elongated body (3;
300) and retained therein by the circumferential edge (15) of the elongated body (3;
300), and
that has a main hole (24;
240) directed along the central axis(s) of the spheroidal part (21;
210),
wherein
the spherical seat (8) in the elongated body (3) and the spherical seat (14) in the cup-shaped part (132;
133;
135) of the intermediate articulated element (102;
103) have a blind hole (34), extending from the respective spherical seat (8;
14), along the central axis (t, c), blind hole (34) which houses a permanent magnet (35) suitable for exerting an attractive force on a consecutive intermediate articulated element (102;
103) and on the terminal articulated element (112;
113), so as to keep the mandrel straight against the force of gravity, when not in use.

50 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/998,023Filed 29 Apr 2021
Priority: IT 1020200000099615 May 2020
Published: US 2023/0173565 A18 Jun 2023
Granted: 27 May 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

B21D 9/01
Bending tubes using mandrels or the like: the mandrel being flexible and engaging the entire tube length
B21D 9/03
The mandrel being flexible and engaging the entire tube length: and built-up from loose elements, e.g. series of balls
B21D
Working or processing of sheet metal or metal tubes, rods or profiles